The Copper King prospect is located at 1584 metres elevation, on a tributary of Cooper Creek on the southeastern slopes of Mount Cooper. Kaslo, British Columbia lies 37 kilometres to the southeast.
Early work on the property dates back to 1907 when it is reported two adits were driven, the upper adit 4.3 metres long and the lower adit 27 metres long. Property work is also reported in 1908. The property area was re-staked by O. Janout in 1974 and prospected until 1976.
The Copper King prospect is underlain by metavolcanics and metasediments of the Permian Kaslo Group. The Kaslo Group strikes northwest and is folded into a broad anticline plunging moderately to the southeast. Metasediments and volcanics of the Kaslo Group are intruded by quartz monzonite stocks and felsite dikes and sills.
The Copper Cliff prospect consists of four laterally restricted massive sulphide lenses hosted within a lens-shaped felsic metavolcanic-sedimentary sequence within andesite flows. Sediments include laminated chert and cherty argillite, siliceous chert and quartzite. Metavolcanics include andesite tuffs and massive rhyolite flows with rare quartz eyes and rhyolite breccia.
The massive sulphides consist of pyrrhotite, with lesser chalcopyrite, sphalerite, pyrite and galena. The two southernmost lenses are up to 30 centimetres wide and traceable for no more than 60 centimetres. The thickest concentration of massive sulphides is found in the old upper adit. At the back of this adit, 1.8 metres of pyrrhotite-pyrite-chalcopyrite-sphalerite mineralization is hosted within cherty argillite. A second 60-centimetre wide lens of massive sulphide is separated by cherty argillite. The massive sulphide lenses pinch out sharply over 6 metres strike length to a 15 to 30 centimetre horizon traceable on surface for up to 30 metres. In a nearby creek, two 60-centimetre wide massive sulphide lenses consisting of pyrrhotite-pyrite-chalcopyrite outcrop and are separated by 45 centimetres of chert. The lenses have a 4.5 metre strike length.
Several rock chip samples were taken from the property. The best assay results were from samples 14733 to 14735, from the upper adit. Grab sample 14733, from the upper portal over roughly 75 centimetres, yielded 0.34 gram per tonne gold, 9.63 grams per tonne silver, 2.22 per cent copper and 0.6 per cent zinc (Assessment Report 6536).